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Korea
Sangdong Project

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 Location:
14 km W from Taebaek, Korea

  Project Contacts:
100 King Street West Suite 5700
Toronto
Ontario, Canada
M5X 1C7
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Fax+1-416-628-2516
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Overview

StageConstruction
Mine TypeUnderground
Commodities
  • Tungsten
  • Molybdenum
Mining Method
  • Mechanized inclined panel mining
  • Cut & Fill
  • Paste backfill
Processing
  • Filter press plant
  • Dewatering
  • Flotation
  • Rotary kiln & Electric furnace
Mine Life13 years (as of Jan 1, 2016)
The construction of Sangdong is on budget and on schedule. Underground mine development continues as planned.

Once Sangdong is in production from Q4 2022, Almonty is expected to produce approximately 30% of all tungsten outside of China and approximately 7-10% of global supply.
Latest NewsAlmonty Industries Inc.: Drawdown of KfW US$75 Million Loan Imminent Following Satisfaction of All Conditions Precedent     February 7, 2022


Owners

Source: p. 4
CompanyInterestOwnership
Almonty Industries Inc. 100 % Indirect
Ownership Tree
Almonty having a 100% ownership interest in Woulfe. The principal asset of Woulfe is the Sangdong tungsten mine project located in Gangwon Province, Republic of Korea (the “Sangdong Mine”).

Deposit Type

  • Skarn
  • Footwall hosted


Summary:

The Property contains a tungsten skarn deposit; skarns are contact metasomatic deposits, exploited for tungsten, with accessory molybdenum, copper, tin and zinc.

The tungsten mineralisation of the Sangdong deposit is contained in several tabular, beddingconformable skarns in the Myobong Shale; these skarns have been interpreted as comprising carbonate-bearing horizons that were altered and mineralised by fluids ascending from the underlying Sangdong Granite.

From uppermost to lowermost, these horizons are termed the Hangingwall, Main, and Footwall horizons. Calc-silicate layers from 0.50 – 1.0m in thickness have developed on the upper and lower contacts of the Main and Footwall horizons.

The Hangingwall horizon is located near the upper contact of the Myobong shale and varies in thickness from approximately 5.0 to 30.0m because of the irregular boundary of the shale with the overlying Pungchon Limestone. This zone has a strike length of about 600m and a down-dip extent of about 800m. Above the most highly-altered portion of the Main horizon, the Hangingwall horizon is not tabular, but extends steeply and irregularly into the overlying limestone. The Hangingwall horizon contains diopside, garnet, fluorite, zoisite, quartz, hornblende, wollastonite and up to 50% calcite and although there is some zonal variation in mineral assemblages (diopside-, hornblende- and quartzrich zones) the zonation is not as well- developed as in the underlying Main horizon. The tungsten values show some zonation and decrease in value up-dip. The base of the Hangingwall horizon is approximately 14m above the upper contact of the Main horizon.

The Main horizon strikes about 100° and dips northerly between 15° and 30°. The strike length is in excess of 1,300m and thickness varies from 5.0 – 6.0m. Alteration (skarnification) within the Main horizon forms three concentric, roughly circular zones. A central quartz-rich zone consisting of muscovite, biotite, quartz and minor chlorite is about 350m in diameter and plunges down the Main horizon at N05°W and is coincident with the higher tungsten grade portion of the deposit. The central zone is succeeded outward by a hornblende-rich zone containing diopside, hornblende or tremolite, chlorite, fluorite and calcite. A diopside-rich zone occurs both horizontally beyond and stratigraphically above the hornblende-rich zone and contains garnet, diopside, quartz, fluorite, zoisite and plagioclase. The diopside zone is typically poorly-mineralised. Boundaries between these zones are diffuse and transitional.

The Footwall horizons comprise multiple layers: Footwall Zone 1 (F1) occurs 1m below the Main horizon and is approximately 2m thick; Footwall Zones 2 and 3 (F2, F3) are situated approximately 35.0 to 40.0m below the Main horizon and are less than 1m thick. Further Footwall Zones have been identified beyond F3 and are collectively referred to as F4. Areal dimensions of these horizons and the zonal distribution of calc-silicate minerals in them are similar to those of the Main horizon. F1 has sometimes been mined with extraction of the Main Zone. Some parts of F2 and F3 have been mined in the upper section of the mine.

The Sangdong deposit contains scheelite, minor wolframite, molybdenite, bismuthenite and native bismuth. Molybdenum also occurs in substitution with scheelite and about 30% of the molybdenum produced at Sangdong was scheelite-related. Gold and silver occur in association with bismuthinite and native bismuth and were recovered from the bismuth concentrate. Tellurides, arsenopyrite, pyrite, chalcopyrite and sphalerite also occur.

Mineralisation is largely associated with quartz veins within those horizons, with the exception of the central portion of the Hangingwall horizon. Quartz veins are most abundant within a central, quartzrich portion of the deposit, parallel to and discordant with the calc-silicate layering. Veining ranges from one to ten centimetres in width and is best developed in the lower portions of the mineralised horizons.

The abundance of scheelite within the mined portion of the Main horizon is concentrically zoned, increasing with alteration intensity, depending on temperature. Scheelite abundance in the Hangingwall horizon is more variable and less clearly concentrated in zones.

Molybdenum and bismuth are concentrically zoned in a similar pattern to tungsten in the Main horizon.

The area is cut by steeply north dipping reverse and normal faults which have resulted in offsets of the mineralised horizons by as much as 50-100m.

Sangdong East (“East WO3 Orebody") is located about 1km to the east from the Main deposit. It is essentially an extension of the main mine area, and stratigraphy and lithologies are similar. In contrast, however, the Hangingwall (Upper) horizon, Main horizon, and Footwall (Lower) horizons are thinner, and have a lower frequency of quartz veins. The constituent minerals are pyroxene and garnet with accessory plagioclase, quartz, apatite, hornblende and wollastonite.

In the Sangdong West area (“West WO3 Orebody"), mineralisation and stratigraphy are similar to the main Sangdong Mine, but skarn horizons are thinner, and there is a lower frequency of quartz veining than in the Main horizon. The vein width and grade of tungsten mineralisation do, however, increase northward to the Hwajeolchi area.


Mining Methods

  • Mechanized inclined panel mining
  • Cut & Fill
  • Paste backfill


Summary:

Based on the latest understanding of the orebody geometry and mining areas, and evaluation of the resources, including in-situ thickness variations, it was decided to apply two proposed mining methods:

- Mechanized Inclined Panel mining (MIP) – areas where the thickness less than 3 metres.
- Cut-and-Fill (CAF) – for areas where the thickness is greater than 3 metres.

The envisaged MIP method involves drifting on apparent dip, so as not to exceed a gradient of 15%, and so allow trackless equipment. The stope development is planned to be symmetrical, with panels being extended both up and down from access galleries.

This method is very flexible, in allowing working upwards or downwards, and conversion to cut-and-fill.

The sequencing of MIP stoping operations will be:
1. Development of level strike drives, the base transport gallery.
2. Ore Drifts will be developed oblique to strike drive, at a maximum gradient of 15%. These drifts will be 3m x 3m, and will spaced 12m apart, to form one side of each primary panel. These drives will be extended to the next upper or lower level, and so will have a strike length of approximately 175m.
3. The ore drives will be slashed out an additional width of 3m, to leave the primary panels 6m wide. For ore regions less than 3m in thickness, the slash height can be limited down to 1.5 m minimum.
4. When the primary panels are complete, fill barricades will be required at the base level of each panel. No barricade will be needed in downwardly developed panels, if they have no connected with the base strike drifts. The barricades can be constructed from waste piles, which are then shotcreted to prevent fill leakage.
5. The primary panel(s) can then be backfilled with paste backfill and cement. As the drifts are inclined this filling should end up tight to the back.
6. After curing the primary panels’ backfill, secondary panels can be mined out in the same way as the primaries. The backfilling of secondary stopes can be done with a reduced amount of cement.

In the slashing operation, dilution can be dramatically reduced, with parallel drilling to the ore structure, as well as a much reduced height. All drilling for these slashes can be inside the mineralized structure, with up to two blasts of 1.5 m width on the up-side. Dilution of 15% (maximum) on drifting and almost no dilution with slashing, should give a combined maximum dilution of 7.5 %, and an average dilution of approximately 5%.

Cut-and-Fill (CAF) Method.
This method will be applied to ore zone areas with a thickness of 3m and higher, up to 20m depending on the local ore thickness. It can be considered a simplification of the previous Inclined Panel Stoping, and in some areas it could also be adapted with uppers for extraction of panels up to 12m in height. One particular advantage of this method is the potential high selectivity, with separate removal of internal waste encountered.

From the strike drive, the primary panels are opened in the ore, perpendicular to the strike drive and developed across to the footwall contact. These panels wiil be inclined upwards, to a maximum gradient of 15% to assist with tightfilling during subsequent backfilling operations, and also to create longer stopes. Both primary and secondary panels are nominally planned to be 6m x 6m in cross-section.

After the backfilling of the entire first 6 m lift, access to the next 6m lift will be from the hanging-wall incline. Access to stope panels behind the incline will need to be done by the footwall strike drift. The backfilling will continue through the footwall strike drive, with multiple barricades in the primary stope panels and with two barricades per sector for secondary stope panels.

In the MIP mining, drilling will be done with single arm electric/hydraulic jumbos. Drill steels will be 3m, allowing an effective advance/blast of 2.1m in drifting, and 1.5m advance/blast in the slashing. Slashing lengths will be adapted to the local ore exposures ore blending requirements. The drive patterns will typically be a 600mm x 600 mm pattern, with an extra 9 burn-cut holes, 4 of which are reamed. The slash holes will be drilled on a 900 mm by 900 mm pattern. Perimeter holes may be drilled on a similar pattern, depending ground conditions.

In the CAF zones, drilling will be with two arm electric-hydraulic jumbos, that will have 3.6m rods, drilling 44 mm drillholes of 3.1 m length and an effective 2.6 m advance per blast. The burn cuts will have a similar pattern to MIP, and the remaining drillholes will have a pattern of 1m x 1m. Perimeter holes may be drilled on a similar pattern, depending on ground conditions.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 1
Ball mill 4.2m x 4.6m 1400 kW 1
Rod mill 3.3m x 4.9m 725 kW 1

Summary:

The run of mine (ROM) ore from the mine will be received in a feed hopper equipped with an inclined 600 mm square opening grizzly. A rock breaker will be used to bring the grizzly oversize down to 600 mm. The ore will be extracted from the feed hopper by an apron feeder which discharges onto a belt conveyor. The belt conveyor will feed a primary jaw crusher through a static grizzly feeder, which prevents the feeding of the fine fraction to the jaw. The jaw crusher discharge and the fine fraction will be conveyed by a 914 mm transfer belt conveyor.

The ore will be drawn from the coarse ore stockpile by one or two variable speed apron feeders. The feeders discharge onto a 914 mm belt conveyor carrying the ore to a Rod mill of 3.3 m diameter x 4.9 m long, driven by a variable speed 725 kW WR motor.

The Rod mill discharge will be classified through a cyclone cluster consisting of 10 cyclones of 250 mm diameter (9 in operation and 1 standby). The cyclones underflow will be reground in a ball mill of 4.2 m diameter x 4.6 m long, driven by a synchronous 1,400 kW WR motor.


Processing

  • Filter press plant
  • Dewatering
  • Flotation
  • Rotary kiln & Electric furnace

Flow Sheet: Subscription required

Summary:

The processing plant will have a capacity of 1,920 metric tons per day.

The main process steps for treating the Sangdong ore are primary, secondary and tertiary crushing and stockpiling; grinding; flotation divided into two (2) sub-circuits (sulphide flotation and tungsten flotation); thickening; filtration and packaging section; a waste water treatment facility; and services section.

The cyclone overflow, at a P80 of 75 microns, will be directed by gravity to the sulphide flotation circuit conditioning tank.

The pulp from the 7-minutes conditioning tank will be pumped to the sulphides rougher flotation bank (2+3 x 15 m3 cells for molybdenum roughing and 2+2 x 15 m3 for other sulphide roughing). The rougher concentrates will be pumped by vertical spindle pumps to the respective cleaner banks, each of 2 x 5 m3 cells. The cleaner concentrate is directed to the final tails pump box. The cleaner tails are combined with the rougher tails and pumped to a 20 ........

Recoveries & Grades:

CommodityParameterAvg. LOM
WO3 Recovery Rate, % 81
WO3 Head Grade, % 0.69
WO3 Concentrate Grade, % 65

Projected Production:

CommodityUnitsLOM
WO3 mtu 2,867,168
All production numbers are expressed as WO3 in concentrate.

Operational Metrics:

Metrics
Daily ore mining rate 1,830 t *
Ore tonnes mined, LOM 7,896 kt *
Annual milling capacity 640 kt *
Annual production capacity 5,519 t of wo3 concentrate *
Daily processing capacity 1,920 t *
* According to 2016 study.

Reserves at July 31, 2016:
For Reserves WO3 Cut-offs applied:
0.36% Max Spans <=3m
0.28% Max Spans >3m <=6m
0.23% Max Spans +6m

For Resources cut-off grade is 0.15% WO3.

Reported Reserves and Resources have not changed on May 14, 2021. [2020 AIF, 61-62]

CategoryTonnage CommodityGradeContained Metal
Probable 7,896 kt WO3 0.45 % 3,553,200 mtu
Indicated 8,029 kt WO3 0.51 % 4,094,790 mtu
Indicated 8,029 kt Molybdenum 0.06 %
Inferred 50,686 kt WO3 0.43 % 21,794,980 mtu
Inferred 50,686 kt Molybdenum 0.05 %

Commodity Production Costs:

CommodityUnitsAverage
Cash costs WO3 USD 110 / mtu *†
Assumed price WO3 USD 370 / mtu *
* According to 2016 study / presentation.
† Net of By-Product.

Operating Costs:

Units2016
UG mining costs ($/t milled) USD 32.3 *
Processing costs ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2016 study.
Subscription required - Subscription is required.

2016 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 86
G&A costs $M USD 39
Total OpEx $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 5% $M USD  ......  Subscription required
Pre-tax NPV @ 8% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of June 30, 2016:
HME TypeSizeQuantity
ANFO Loader 101 HP ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
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....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 9, 2021
....................... Subscription required ....................... Subscription required Subscription required Jun 9, 2021
....................... Subscription required ....................... Subscription required Subscription required Jun 9, 2021
Subscription required - Subscription is required.

Staff:

EmployeesTotal WorkforceYear
Subscription required 2020
Subscription required 2019
Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Corporate Presentation 2018
Management Discussion & Analysis 2018
Feasibility Study Report 2016
Technical Report 2016
Subscription required - Subscription is required.

News:

NewsDate
Almonty Industries Inc.: Drawdown of KfW US$75 Million Loan Imminent Following Satisfaction of All Conditions Precedent February 7, 2022
An Operational Update From Almonty Industries Inc. Released Earlier This Morning on the ASX September 13, 2021
Lewis Black and the Plansee Group Conclude Share Sale/Purchase Prior to KfW IPEX Bank Financial Close for the Construction of the Sangdong Tungsten Mine April 20, 2021
Almonty Industries Inc. Provides Update for Its Sangdong Mine in South Korea October 21, 2020
Almonty Announces the Acceptance by the Lending Bank of the Final Technical Due Diligence Report on the Sangdong Mine Development Project and the Commissioning of the Pilot Plant July 29, 2019
Almonty Industries Inc. Announces the Commencement of the Mine Development Work at Its Wholly-Owned Sangdong Mine November 27, 2018
Almonty Provides Update on the Project Financing for the Sangdong Mine October 5, 2018

Aerial view:

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